Latest articles by Sarah Wells
Why is it still so hard to make nuclear weapons?
Scientists have been building nuclear weapons for more than 80 years, but crafting this technology remains a challenge.
What if a giant asteroid had not wiped out the dinosaurs?
Nonavian dinosaurs have been extinct for 66 million years, but what would have happened if they'd survived?
Do atoms ever touch?
Atoms make up everything around us, but do these building blocks of matter ever actually touch?
Can gray hair be reversed?
Gray hair is often a sign of aging, but is it possible to delay its advance or reverse the color change?
How did the Concorde fly so fast?
The Concorde was the fastest commercial plane ever flown, but its speed came with a hefty price tag.
How far away is the moon?
The moon's distance from Earth changes depending on where it is in its elliptical orbit.
Why does metal squeak?
Squeaking metal can be grating on the nerves, but it serves an important purpose.
Will we ever reach Alpha Centauri, our closest neighboring star system?
Visiting our nearest stellar neighbor will take near-light-speed travel.
Why does cotton shrink?
The science of ruining your favorite shirt is more complicated than you might think.
Have days on Earth always been 24 hours?
Earth's day used to be five hours shorter, and it's predicted to continue lengthening over time.
What could aliens look like?
The search for alien life is one of humanity's greatest missions, but it may look nothing like anything we've seen on Earth.
